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Re: position on changing defaults?

From: Richard Stallman
Subject: Re: position on changing defaults?
Date: 2008年3月06日 22:38:56 -0500 
 Unfortunately, I see no way of implementing this in simple.el without
 using pre-command-hook and post-command-hook. It seems this can be
 implemented only in C in the function that reads characters.
Maybe I can see a way to do it using nicer underlying mechanisms.
I am not entirely sure what the feature does; what does it need
these hooks for?
Miles wrote:
 How about adding a new type of binding, a "modifier binding", which
 could serve to implement CUA movement, and replace the current automatic
 S-foo => foo remapping.
I do not understand -- what would this "modifier binding" mean,
and how would you use it for this?
 Basically, these would be bindings that represent event-modifiers only.
 If normal key lookup fails, the keymapping mechanism would then look up
 and invoke the modifier binding corresponding to the modifiers on the
 key, and invoke it instead; the invoked function could then, if it
 wished (e.g. for CUA), set some variables or frob some state and
 re-invoke the event with the modifiers removed.
I am still not sure I understand. If it means a kind of default
binding for all Shift keys that have no individual binding,
why is that better than binding the four shift-arrow keys
in the global map?
 In general, I agree with the idea of exposing the translation of unbound
 event-modified keys to Lisp functions that can process untranslated keys.
 Maybe it would be possible to implement the following interface to define
 such bindings?
 (define-key global-map [(shift untranslated)]
 (lambda ()
 (interactive)
 (when (and transient-mark-mode (not mark-active))
 (push-mark-command nil nil))))
What does (shift untranslated) mean, and what would it do? And how
does it relate to this feature?
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